Buggy code:
public class SourceElementParser extends Parser { ISourceElementRequestor requestor ; int fieldCount ; ISourceType sourceType ; boolean reportReferenceInfo ; char [ ] [ ] typeNames ; char [ ] [ ] superTypeNames ; int nestedTypeIndex ; static final char [ ] JAVA_LANG_OBJECT = "java.lang.Object" . toCharArray ( ) ; NameReference [ ] unknownRefs ; int unknownRefsCounter ; SourceElementParser . LocalDeclarationVisitor localDeclarationVisitor = null ; CompilerOptions options ; public class LocalDeclarationVisitor extends ASTVisitor { public boolean visit ( TypeDeclaration typeDeclaration , BlockScope scope ) { } public boolean visit ( TypeDeclaration typeDeclaration , ClassScope scope ) { } } public SourceElementParser ( final ISourceElementRequestor requestor , IProblemFactory problemFactory , CompilerOptions options ) { } public SourceElementParser ( final ISourceElementRequestor requestor , IProblemFactory problemFactory , CompilerOptions options , boolean reportLocalDeclarations ) { } public void checkComment ( ) { super . checkComment ( ) ; <START_BUG> if ( ( ( this . reportReferenceInfo ) && ( this . javadocParser . checkJavadoc ) ) && ( ( this . javadoc ) != null ) ) { <END_BUG> TypeReference [ ] thrownExceptions = this . javadoc . thrownExceptions ; int throwsTagsNbre = ( thrownExceptions == null ) ? 0 : thrownExceptions . length ; for ( int i = 0 ; i < throwsTagsNbre ; i ++ ) { TypeReference typeRef = thrownExceptions [ i ] ; if ( typeRef instanceof JavadocSingleTypeReference ) { JavadocSingleTypeReference singleRef = ( ( JavadocSingleTypeReference ) ( typeRef ) ) ; this . requestor . acceptTypeReference ( singleRef . token , singleRef . sourceStart ) ; } else if ( typeRef instanceof JavadocQualifiedTypeReference ) { JavadocQualifiedTypeReference qualifiedRef = ( ( JavadocQualifiedTypeReference ) ( typeRef ) ) ; this . requestor . acceptTypeReference ( qualifiedRef . tokens , qualifiedRef . sourceStart , qualifiedRef . sourceEnd ) ; } } Expression [ ] references = this . javadoc . references ; int seeTagsNbre = ( references == null ) ? 0 : references . length ; for ( int i = 0 ; i < seeTagsNbre ; i ++ ) { Expression reference = references [ i ] ; acceptJavadocTypeReference ( reference ) ; if ( reference instanceof JavadocFieldReference ) { JavadocFieldReference fieldRef = ( ( JavadocFieldReference ) ( reference ) ) ; this . requestor . acceptFieldReference ( fieldRef . token , fieldRef . sourceStart ) ; acceptJavadocTypeReference ( fieldRef . receiver ) ; } else if ( reference instanceof JavadocMessageSend ) { JavadocMessageSend messageSend = ( ( JavadocMessageSend ) ( reference ) ) ; int argCount = ( ( messageSend . arguments ) == null ) ? 0 : messageSend . arguments . length ; this . requestor . acceptMethodReference ( messageSend . selector , argCount , messageSend . sourceStart ) ; acceptJavadocTypeReference ( messageSend . receiver ) ; } else if ( reference instanceof JavadocAllocationExpression ) { JavadocAllocationExpression constructor = ( ( JavadocAllocationExpression ) ( reference ) ) ; int argCount = ( ( constructor . arguments ) == null ) ? 0 : constructor . arguments . length ; char [ ] [ ] compoundName = constructor . type . getTypeName ( ) ; this . requestor . acceptConstructorReference ( compoundName [ ( ( compoundName . length ) - 1 ) ] , argCount , constructor . sourceStart ) ; acceptJavadocTypeReference ( constructor . type ) ; } } } } private void acceptJavadocTypeReference ( Expression expression ) { } protected void classInstanceCreation ( boolean alwaysQualified ) { } protected void consumeConstructorHeaderName ( ) { } protected void consumeExitVariableWithInitialization ( ) { } protected void consumeExitVariableWithoutInitialization ( ) { } protected void consumeFieldAccess ( boolean isSuperAccess ) { } protected void consumeMethodHeaderName ( ) { } protected void consumeMethodInvocationName ( ) { } protected void consumeMethodInvocationPrimary ( ) { } protected void consumeMethodInvocationSuper ( ) { } protected void consumeSingleTypeImportDeclarationName ( ) { } protected void consumeTypeImportOnDemandDeclarationName ( ) { } public MethodDeclaration convertToMethodDeclaration ( ConstructorDeclaration c , CompilationResult compilationResult ) { } protected FieldDeclaration createFieldDeclaration ( char [ ] fieldName , int sourceStart , int sourceEnd ) { } protected CompilationUnitDeclaration endParse ( int act ) { } public TypeReference getTypeReference ( int dim ) { } public NameReference getUnspecifiedReference ( ) { } public NameReference getUnspecifiedReferenceOptimized ( ) { } private boolean isLocalDeclaration ( ) { } public void notifySourceElementRequestor ( CompilationUnitDeclaration parsedUnit ) { } private void notifyAllUnknownReferences ( ) { } public void notifySourceElementRequestor ( AbstractMethodDeclaration methodDeclaration ) { } public void notifySourceElementRequestor ( FieldDeclaration fieldDeclaration ) { } public void notifySourceElementRequestor ( ImportReference importReference , boolean isPackage ) { } public void notifySourceElementRequestor ( TypeDeclaration typeDeclaration , boolean notifyTypePresence ) { } private int sourceEnd ( TypeDeclaration typeDeclaration ) { } public void parseCompilationUnit ( ICompilationUnit unit , int start , int end , boolean fullParse ) { } public CompilationUnitDeclaration parseCompilationUnit ( ICompilationUnit unit , boolean fullParse ) { } public void parseTypeMemberDeclarations ( ISourceType type , ICompilationUnit sourceUnit , int start , int end , boolean needReferenceInfo ) { } public void parseTypeMemberDeclarations ( char [ ] contents , int start , int end ) { } private static void quickSort ( ASTNode [ ] sortedCollection , int left , int right ) { } private char [ ] returnTypeName ( TypeReference type ) { } public void addUnknownRef ( NameReference nameRef ) { } private void visitIfNeeded ( AbstractMethodDeclaration method ) { } private void visitIfNeeded ( FieldDeclaration field ) { } private void visitIfNeeded ( Initializer initializer ) { } }

Fix:
if ( ( ( this . reportReferenceInfo ) && ( this . javadocParser . checkDocComment ) ) && ( ( this . javadoc ) != null ) ) {